A Wind Velocity Calculation Method Based on Ultrasonic Line Mine Return Air Shaft

Abstract

The invention provides a method for measuring and calculating the wind speed of a mine return air shaft based on an ultrasonic line. An ultrasonic speed measuring system is established through a position in the mine return air shaft where the wind speed needs to be measured, and an ultrasonic speed measuring instrument is reasonably arranged. Two sets of ultrasonic velocimeters were set up to improve the accuracy. The average wind speed of the two intersecting lines was measured by ultrasonic velocimeter. By establishing a linear wind speed model to calculate the average wind speed of the return shaft, the method can measure the average wind speed of the return shaft quickly and accurately, improve the measurement accuracy, adapt to the harsh environment of the return shaft, and has stronganti-interference ability.

Description

technical field [0001] The invention relates to a method for measuring and calculating wind speed in a mine, in particular to a method for measuring and calculating wind speed in a mine return air shaft based on an ultrasonic line, and belongs to the technical field of mine ventilation and safety. Background technique [0002] Mine ventilation is one of the most important technical means to ensure mine safety. It is the most effective, economical, and direct means to prevent and control gas, fire, and dust disasters. Poor mine ventilation can directly lead to major accidents such as gas explosions and fires. In the mine production process, it is necessary to continuously transport fresh air from the ground to the underground operating sites to supply personnel with breathing, dilute and eliminate various toxic and harmful gases and mineral dust in the mine, and create a good working environment in the mine. Ensure the health and labor safety of underground workers. [0003]...

AI Technical Summary

Problems solved by technology

[0003] Rapid and accurate measurement of underground air volume is the basis of mine ventilation safety management. However, the ventilation system of large and medium-sized mines is usually a nonlinear fluid network composed of hundreds or even thousands of air ducts. The air volume of the return air shaft is large and the environment is harsh. , the wind flow is disordered, and many mines use manual monitoring or point wind speed monitoring for the wind speed of the return air shaft;

[0004] If manual wind measurement is adopted, if there is no fan on the surface of the shaft that needs to monitor the wind speed, the return air shaft is the general channel for underground dust, diesel scraper, pickup truck and other trackless equipment exhaust, mining operation gun smoke and other toxic and harmful gases to collect and discharge to the surface , the return air shaft, especially the main return air shaft, has a wind speed of more than 10m / s, and manual wind measurement has the safety risks of toxic and harmful gas poisoning and falling into the air shaft

In the practice of ventilation, in order to ensure safety, the wind speed instrument is used to measure the wind speed at several points in the same ventilation section at the shaft outlet, and then calculate the average wind speed. The relative humidity of the wind is almost 100% saturated, and its dust, gun smoke, and humidity not only affect the measurement accuracy and reliability of the anemometer, but also endanger the respiratory health of the measurement personnel;

[0005] If manual wind measurement is adopted, if the fan is installed on the surface of the well shaft where the wind speed needs to be monitored, the air flow in the fan inlet section is relatively stable, and it is generally selected to be measured at the fan inlet section, but the air inlet section is short from the location of the wind well, and the wind speed in the fan inlet section It can be as high as 20m / s or more, the roadway ground is slippery and the water mist is large, and the vision is blurred. A little carelessness during manual wind measurement may fall into the wind shaft; of course, there are also dust, gun smoke, and humidity that affect the measurement accuracy and reliability of the wind speed instrument. , Respiratory health problems of hazard determination personnel;

[0006] For point wind speed monitoring, the common method is to install wind speed sensors directly in the well shaft or at the inlet and outlet of the fan, but the wind speed sensor can only collect one point wind speed of the ventilation section, and more importantly, the return air shaft sewage, wind, water mist and dust become the wind speed sensor collection The bottleneck of data accuracy and service life directly reduces the stability and reliability of the ventilation online monitoring system data, resulting in large errors

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